> From: Tapani T. Salmi <
spam_OUTtaiskaTakeThisOuT
TUUG.ORG>
> To:
.....PICLISTKILLspam
@spam@MITVMA.MIT.EDU
> Subject: PIC16F84 COM84 programming again...
> Date: 26 February 1997 01:37
>
> Does someone know the common problems & solutions for the COM84
> programmer? My attempts to program PIC16F84 with COM84 has been
> very unsuccesful.
>
> I build my COM84 with instructions found from
>
http://hobbes.king.ac.uk/matt/pic/prog.html. Is that circuit ok? When I
> write something with pip02 program (I use com84.exe driver, does it work
> with 16F84) I get programming error. Reading the chip always tells me 3f
> ff stuff.
>
> Even that the circuit is very simple, I tried it again: I asked my friend
> to make the COM84, we used a fresh PIC and his computer. Nada, same
> symptoms.
>
> But I think that there is something strange going on, because while
> programming, my multimeter shows only about 5-6V as the voltage of MCLR.
> As far as I know, it can't be right? It should be higher? Is the problem
> too low voltage, possibly caused by lame serial ports? (but if it's so,
> lame RS ports are very common; I have tried two different mother board
> integrated and one separate adapter card) Or is MCLR switched on/off
> during write procedure?
>
> Please, can you tell me what is going wrong?
>
> /Taiska (novadays known as Desperado :(